Sewer backflow preventers are an essential part of your home's plumbing. Here's why you need one and how to test if yours is ...

Backflow preventers are assemblies with two check valves and two shut-off valves that prevent reverses in process flow. They may also include test cocks for each chamber within the assembly. Backflow ...

A big pipe carries waste from your house to the main sewer line under the street. If either becomes plugged or overloaded, ...